The present invention is an upper open pipe structure, connected to the drain pipe of the lower part of the casing installed in the casing to diverge the washing liquid or disinfectant, the inlet pipe 102 having a threaded portion in the outer diameter, and the inlet pipe 102 from the side so as to be orthogonal to the inlet pipe 102 At least one discharge pipe 104 is formed to match the height of the lower bottom surface of the inlet pipe 102 and the bottom of the inner diameter surface, and the threaded portion protrudes toward the outer diameter of the inlet pipe 102, and a washing liquid is added to the threaded portion of the discharge pipe 104. At least one of a drain valve 110 connected to a drain line to discharge the discharge pipe 104 to open and close, and a disinfectant valve 112 connected to a recovery line for recovering the disinfectant solution to the disinfectant storage tank to open and close the discharge pipe 104 It relates to an endoscope cleaning device having a disinfectant dilution prevention function including the fastened drain valve body 100, and more particularly, a protrusion 102a is formed on the lower bottom surface of the drain valve body 100 to be convex. . Therefore, by forming a tapered portion having a certain inclination on the bottom of the inlet pipe or forming a dome or conical protrusion, only a small amount of washing liquid remains on the bottom of the inlet pipe, thereby minimizing the amount of mixing with the disinfectant solution when recovering the disinfectant solution. Thus, it provides an endoscope cleaning device having a disinfectant dilution preventing function to prevent the dilution amount of the disinfectant solution.본 발명은 상부개방형 관구조로서, 케이싱에 설치된 수반부 하부의 배수관에 연결되어 세척액 또는 소독액을 분기시키며, 외경에 나사부가 형성된 인입관(102)과, 상기 인입관(102)으로 직교되도록 측면에서 인입관(102) 하부 바닥면의 높이와 내경면 저부가 일치되도록 관통형성되고, 인입관(102) 외경으로 나사부가 돌출된 적어도 하나 이상의 배출관(104)과, 상기 배출관(104)의 나사부에는 세척액을 배출시키는 배수라인과 연결되어 배출관(104)을 개폐하는 배수밸브(110)와, 소독액을 소독액저장탱크로 회수시키는 회수라인과 연결
